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Thread: Collodion - Wet Plate Images

  1. #2031
    Peter
    Join Date
    Apr 2007
    Location
    Morro Bay, Ca
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    670

    Re: Collodion - Wet Plate Images

    Quote Originally Posted by Punker View Post
    Thanks, Andrew! Bixby is on my bucket list for sure. Couldnít find an official name for this bridge. Itís local to L.A. Best name I could find for it was Upper Big Tujunga Canyon bridge.


    Sent from my iPhone using Tapatalk
    After doing some searching, apparently the name of the bridge is (according to wikipedia, and BridgeHunter.com, and others) The Big Tujunga Narrows Bridge, originally named the Armstrong Bridge.
    Nice photos!

  2. #2032

    Join Date
    Jan 2017
    Location
    Los Angeles, CA
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    127

    Re: Collodion - Wet Plate Images

    Quote Originally Posted by Tin Can View Post
    Punker

    Interesting subject with good plates!

    We don't see that many like this
    Many thanks!

    The first plate was a hot mess. Warm and dry yesterday - 80F with 16% humidity. It sucked the moisture right out of them.




    Quote Originally Posted by Peter Mounier View Post
    After doing some searching, apparently the name of the bridge is (according to wikipedia, and BridgeHunter.com, and others) The Big Tujunga Narrows Bridge, originally named the Armstrong Bridge.
    Nice photos!
    That's great to know! Thanks for the research and info!

  3. #2033

    Join Date
    Nov 2012
    Posts
    58

    Re: Collodion - Wet Plate Images

    Sensitize by inspection.

    Does anyone do this? With different temperatures and emulsions, plates sensitize at different rates. Two questions:

    1) What should an adequately sensitized plate look like?
    2) Is there any truth to the fact that over sensitizing (is this even possible?) can cause issues during development?

  4. #2034

    Join Date
    Jan 2017
    Location
    Los Angeles, CA
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    127

    Re: Collodion - Wet Plate Images

    Quote Originally Posted by basiltahan View Post
    Sensitize by inspection.

    Does anyone do this? With different temperatures and emulsions, plates sensitize at different rates. Two questions:

    1) What should an adequately sensitized plate look like?
    2) Is there any truth to the fact that over sensitizing (is this even possible?) can cause issues during development?
    I know it's not considered ideal but I always sensitize by time. 3-5 minutes. I don't have an adequate enough light in either of my darkboxes to check by inspection. To check by inspection, remove the plate from the bath and notice if the silver nitrate flows off of it in one smooth sheet. The plate will also appear milky white. If you see little legs of silver nitrate or it looks oily, chances are it hasn't had enough time. For my area of the world 3 minutes does it in 99% of cases but if it's cold out I'll go up to 5 minutes. All collodions should sensitize the same way in the same time. No harm will likely be done to your plates hanging out in the bath up to 10 minutes.

    Oversensitizing would be like leaving a plate in the bath for 10 minutes or more. If it stays in too long your plates will fog. Not sure what effect it has with the developer when that happens. It very well may be that the developer itself fogs the oversensitized plate. If you leave an aluminum plate in too long, say more than 30 minutes or an hour, maybe longer, the silver nitrate will start to dissolve the plate and it will mess up your bath.

  5. #2035

    Join Date
    Nov 2012
    Posts
    58

    Re: Collodion - Wet Plate Images

    Thank you. Does it look the same “oily” as when rinsing developer?

  6. #2036

    Join Date
    Jan 2017
    Location
    Los Angeles, CA
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    Re: Collodion - Wet Plate Images

    Iím guessing so. But I donít have much experience doing it by inspection. Itís just what I remember reading on the subject. The couple times Iíve done it that way the three minutes did the trick and it came out looking right.


    Sent from my iPhone using Tapatalk

  7. #2037
    Bill
    Join Date
    Oct 2017
    Location
    Houston, TX
    Posts
    17

    Re: Collodion - Wet Plate Images

    The other day I set up a test shot to determine the discrepancy between my ground glass and plate holder in terms of distance from the lens. Doing so also gave me an opportunity to determine the effective resolution of my 4x5 plates when using an Industar 11M 300mm f/9. Here is the entire image, with a smaller crop (taken with macro lens) imposed over it.
    Collodion resolution whole by Bill, on Flickr

    Here is that crop, and a further crop of that.
    Collodion resolution large crop by Bill, on Flickr
    Collodion resolution small crop by Bill, on Flickr

    The close up crop was taken with a 24 megapixel digital camera, and represents around 2.5% of the 4x5 plate. Because that small section seems to hold about as much detail as can be captured with the sensor, it can be extrapolated up to give the entire plate an equivalent resolution of about 980 megapixels. Due to falloff in the lens resolution towards the edges and other such imperfections, this calculated resolution isn't all that accurate or useful, but I figured that some here might still be interested.

  8. #2038

    Join Date
    Jan 2012
    Location
    Granada Hills, CA
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    64

    Re: Collodion - Wet Plate Images

    Quote Originally Posted by Peter Mounier View Post
    After doing some searching, apparently the name of the bridge is (according to wikipedia, and BridgeHunter.com, and others) The Big Tujunga Narrows Bridge, originally named the Armstrong Bridge.
    Nice photos!
    It's also known as "The Bridge to Nowhere" and was once a popular place for bungee jumping because of the remote location and near 10 mile (RT) hike to get there. Please understand that bungee jumping is now not allowed and never happens there any more. Nice job to get a wet plate set-up up there, and to get a photo without any bungee jumpers.

  9. #2039

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    Jan 2017
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    Los Angeles, CA
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    127

    Re: Collodion - Wet Plate Images

    Quote Originally Posted by Fagrid View Post
    The other day I set up a test shot to determine the discrepancy between my ground glass and plate holder in terms of distance from the lens. Doing so also gave me an opportunity to determine the effective resolution of my 4x5 plates
    Bill, this is fascinating. Thanks for sharing.

    Quote Originally Posted by Matt Stage View Post
    It's also known as "The Bridge to Nowhere" and was once a popular place for bungee jumping because of the remote location and near 10 mile (RT) hike to get there.
    Very interesting, Matt. Now at least it's easily accessible by road. It's funny because Jay Leno drove by in a GT40 as we were shooting and honked and waved.
    So you're in Granada Hills? I'm in Woodland Hills. We should go shoot sometime. I'll be at the LA County Arboretum this Friday morning.

  10. #2040

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    Jan 2017
    Location
    Los Angeles, CA
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    127

    Re: Collodion - Wet Plate Images

    Oh and word to the wise, don't mix UVP-X and New Guy collodions together. It worked beautifully for me the first day, but the next time I used it 2 weeks later, every plate fogged and had streaks and pinholes. Luckily I had another collodion with me that worked fine and was able to figure out that was the problem.

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